When a direct-current （DC） machine runs at extremely low speed or standstill, the reduction in the armature resistance and the armature flux linkage due to the short circuited coils by the brushes on the commutator ...When a direct-current （DC） machine runs at extremely low speed or standstill, the reduction in the armature resistance and the armature flux linkage due to the short circuited coils by the brushes on the commutator should not be neglected. Taking this reduction effect into account, the average values of the reduction coefficients relate to the machine parameters in complicated forms. In this paper, an effective algorithm for the precise computation of the average values of these reduction coefficients is proposed. Furthermore, in the algorithm, the effect of the insulation thickness between the commutator segments and the multiplicity of the wave winding are considered for the first time. The proposed algorithm can also be accommodated into the computer-aided design （CAD） of a DC machine, which normally runs at extremely low speed or standstill.展开更多
分析了直流电机伺服系统中的不确定性,建立了直流电机伺服系统的不确定性模型,探讨了μ综合控制算法在直流电机跟踪系统中的应用,并使用D-K递推方法进行了计算,给出了最后设计结果。使用M ta lab进行仿真实验比较,证明这种控制算法能够...分析了直流电机伺服系统中的不确定性,建立了直流电机伺服系统的不确定性模型,探讨了μ综合控制算法在直流电机跟踪系统中的应用,并使用D-K递推方法进行了计算,给出了最后设计结果。使用M ta lab进行仿真实验比较,证明这种控制算法能够很好地满足系统需要的控制要求,且具有较强的鲁棒性。展开更多
文摘When a direct-current （DC） machine runs at extremely low speed or standstill, the reduction in the armature resistance and the armature flux linkage due to the short circuited coils by the brushes on the commutator should not be neglected. Taking this reduction effect into account, the average values of the reduction coefficients relate to the machine parameters in complicated forms. In this paper, an effective algorithm for the precise computation of the average values of these reduction coefficients is proposed. Furthermore, in the algorithm, the effect of the insulation thickness between the commutator segments and the multiplicity of the wave winding are considered for the first time. The proposed algorithm can also be accommodated into the computer-aided design （CAD） of a DC machine, which normally runs at extremely low speed or standstill.
